Oleksand Sinner
12+ years of experience crafting exceptional web and mobile experiences with React.js, React Native, TypeScript, and modern frontend technologies.
12+ Years
Professional ExperiencePassionate Frontend Developer
I'm Oleksand Sinner, a Senior Frontend Developer and Team Lead with over 12 years of experience building exceptional web and mobile applications. My journey started in 2012 at 5-Soft, and I've grown through various roles at PerceptionBox, where I currently work as Lead JS Developer.
My core expertise lies in React.js and React Native ecosystems, with deep knowledge in TypeScript, MobX, Redux, and Material UI. I've also worked extensively with Angular, Vue.js, Node.js, and various backend technologies.
Throughout my career, I've delivered 20+ production projects across diverse industries including IoT (smart collars, smart lamps), e-commerce, video streaming, automotive, home security, and enterprise CMS solutions. I'm passionate about clean code, scalable architecture, and mentoring junior developers.
12+ Years
Development Experience
Building web & mobile apps since 2012
20+ Projects
Delivered Successfully
From startups to enterprises
Lead & Senior
Roles
Leading teams & mentoring developers
PerceptionBox
& 5-Soft
Key companies in career journey
Skills & Technologies
12+ years of hands-on experience with modern frontend technologies, from jQuery and AngularJS to React, React Native, and beyond.
Years of Experience by Technology
12+
JavaScript
9+
React.js
7+
TypeScript
6+
React Native
6+
Angular
8+
Node.js
Core Frontend
React.js
98%
TypeScript
95%
JavaScript (ES6+)
98%
HTML5 / CSS3
95%
Mobile Development
React Native
92%
Expo
90%
NativeScript
75%
Ionic
80%
State Management
Redux
95%
MobX
90%
Context API
92%
Zustand
85%
Frameworks
Next.js
88%
Angular (2+)
85%
AngularJS
90%
Vue.js
75%
Also Experienced With
Work Experience
12+ years of progressive experience in frontend development, from full-stack roles to leading development teams on enterprise projects.
Lead JS Developer
PerceptionBox
01.2021 - Present
Leading development of mobile and web application for pets' smart collars.
Architected cross-platform mobile application using Expo and React Native
Implemented state management with Redux for complex data flows
Led team of developers, conducting code reviews and mentoring
Established development best practices and coding standards
Senior JS Developer
PerceptionBox
04.2020 - 11.2021
Developed web application for job search and talent matching platform.
Built scalable frontend architecture with React and TypeScript
Implemented complex matching algorithms on the frontend
Optimized application performance for large datasets
Delivered production-ready application
Senior JS Developer
PerceptionBox
12.2019 - 04.2020
Created web application for cosmetics distribution with e-commerce functionality.
Integrated Shopify platform for e-commerce features
Developed hybrid solution with React and Vue.js
Built responsive UI with modern CSS techniques
Lead JS Developer
PerceptionBox
03.2019 - 12.2019
Led development of web application for video streaming platform.
Architected video streaming infrastructure on AWS
Built backend services with Node.js
Implemented real-time video processing pipelines
Delivered production-ready streaming solution
Team Lead
PerceptionBox
07.2018 - 03.2019
Led development of admin panel for smart lamps IoT control system.
Built IoT dashboard with React and TypeScript
Managed development team and project delivery
Implemented real-time device control features
Frontend Developer
PerceptionBox
05.2018 - 02.2019
Developed web platform for business trips planning and management.
Migrated legacy Angular.js application to Angular
Implemented TypeScript for improved code quality
Delivered production-ready travel planning solution
JS Developer
PerceptionBox
07.2018 - 12.2018
Built mobile application for the automotive industry.
Developed cross-platform mobile app with React Native
Integrated with automotive APIs and services
JS Developer
NDA
03.2018 - 09.2018
Created online store with modern e-commerce features.
Built e-commerce platform with React.js and MobX
Implemented responsive UI with JSS styling
Delivered production-ready online store
JS Developer
PerceptionBox
06.2017 - 03.2018
Developed GetAlert - mobile application with live video for Home Security.
Built mobile app with NativeScript and Angular 5
Implemented live video streaming features
Created responsive UI with HTML5/SASS
Lead Full Stack Developer
PerceptionBox
01.2017 - 06.2017
Led development of composedream.com - unique CMS for enterprise client.
Architected full-stack solution with React/Redux and Node.js
Designed MySQL database schema
Delivered production-ready CMS platform
Senior Full Stack Developer
PerceptionBox
09.2016 - 10.2017
Built unique CMS for a major automotive company.
Developed backend with PHP/Yii framework
Built interactive frontend with jQuery
Managed MySQL database and optimization
Senior Frontend Developer
PerceptionBox
09.2015 - 12.2018
Developed business trips and advisors social network platform.
Built modern SPA with AngularJS and Angular 4
Created mobile-first design with Ionic
Implemented ES6+ JavaScript features
Senior/Lead Frontend Developer
PerceptionBox
03.2015 - 08.2016
Led development of Nodeconductor - services management application for Opennode.
Architected frontend with Angular and React.js
Led frontend development team
Established coding standards and best practices
Frontend Developer
5-Soft
10.2014 - 03.2015
Developed Atelieroom - time management application.
Built interactive UI with jQuery and Angular.js
Implemented AJAX-based features
Full-Stack Developer
5-Soft
05.2013 - 03.2015
Built social network + e-commerce solution for African Americans community.
Developed full-stack application with PHP and Backbone.js
Implemented SphinxSearch for advanced search features
Built responsive UI with jQuery
Full-Stack Developer
5-Soft
05.2012 - 12.2012
Developed multiple web applications including Bontime and Naprimete platforms.
Built time management app with jQuery and HTML5
Created company/services review platform with Yii framework
Implemented caching with Memcached and search with Sphinx
Featured Projects
A selection of 20+ projects delivered over 12 years, showcasing expertise in React, React Native, Angular, Node.js, and modern web technologies.
Smart Pet Collars Platform
Mobile and web application for pets' smart collars. Cross-platform solution with real-time tracking and health monitoring features.
Job Search & Talent Matching
Web application for job search and talent matching with AI-powered recommendations and advanced filtering.
Cosmetics E-commerce Platform
Web application for cosmetics distribution with Shopify integration and modern e-commerce features.
Video Streaming Platform
Web application for video streaming with AWS infrastructure and real-time video processing.
Smart Lamps IoT Dashboard
Admin panel for smart lamps control with real-time device management and IoT integration.
Business Travel Planning
Web platform for business trips planning with Angular migration from legacy codebase.
Automotive Mobile App
Mobile application for the automotive industry with cross-platform support.
GetAlert - Home Security
Mobile application with live video streaming for home security monitoring.
ComposeDream CMS
Unique content management system with React/Redux frontend and Node.js backend.
Automotive CMS
Custom CMS for a major automotive company with PHP/Yii backend.
Business Social Network
Business trips and advisors social network with Ionic mobile support.
Nodeconductor
Services management application for Opennode with Angular and React frontend.
Contact Me
Have a project in mind or want to discuss opportunities? I'd love to hear from you.
Let's Connect
I'm always open to discussing new projects, creative ideas, or opportunities to be part of your vision.